Question

Lucy can assemble a computer​ by herself in 35 minutes. Manny does the same job in 50 minutes. How long will it take them to assemble a computer working together?

Answer 1

Explanation:

I think its 15 I just subtracted the two numbers

Answer 2

Answer: about 20.6 minutes

Explanation:

Given : Lucy can assemble a computer​ by herself in 35 minutes.

Manny does the same job in 50 minutes.

Let t be the time taken by both of them working together.

Then, we have

`(1)/(t)=(1)/(35)+(1)/(50)\\\\\Rightarrow\ (1)/(t)=(35+50)/(35*50)\\\\\Rightarrow\ (1)/(t)=(85)/(1750)\\\\\Rightarrow\ t=(1750)/(85)=20.5882352941\approx20.6`

Hence, it will take approx 20.6 minutes to assemble a computer working together.